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Change recommended Blackbox baudrate to 250000 

This is because the AVR's 230400 baudrate is very inaccurate, while the
250000 baudrate is spot-on.
This commit is contained in:
Nicholas Sherlock 2015-03-07 13:07:03 +13:00
parent 644db9b8fa
commit 3b5d2b6a16
2 changed files with 7 additions and 7 deletions
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8
docs/Blackbox.md
View File

@ -43,7 +43,7 @@ software was developed on a craft with a looptime of 2400. Any looptime smaller
data rate. The default looptime on Cleanflight is 3500.
If you're using a looptime of 2300 or smaller, you will probably need to reduce the sampling rate in the Blackbox
settings, or increase your logger's baudrate to 230400. See the later section on configuring the Blackbox feature for
settings, or increase your logger's baudrate to 250000. See the later section on configuring the Blackbox feature for
details.
## Hardware
@ -59,7 +59,7 @@ it should be reflashed with the [OpenLog Light firmware][] or the special [OpenL
be version 2.0 or higher to allow configuration of baud rates).
The Blackbox variant of the firmware ensures that the OpenLog is using the correct settings, and defaults to 115200
baud. If you are using a looptime of 2500 or smaller, you should set the baud rate to 230400 instead to eliminate
baud. If you are using a looptime of 2500 or smaller, you should set the baud rate to 250000 instead to eliminate
dropped frames.
You can find the Blackbox version of the OpenLog firmware [here](https://github.com/cleanflight/blackbox-firmware),
@ -96,7 +96,7 @@ the best chance of writing at high speed. You must format it with either FAT, or
Power up the OpenLog with a microSD card inside, wait 10 seconds or so, then power it down and plug the microSD card
into your computer. You should find a "CONFIG.TXT" file on the card. You should see the baud rate that the OpenLog has
been configured to. You probably want this to be set to either 115200 (the default) or 230400 (for craft with looptimes
been configured to. You probably want this to be set to either 115200 (the default) or 250000 (for craft with looptimes
smaller than 2500).
Save the file and put the card back into your OpenLog, it should use those settings from now on.
@ -158,7 +158,7 @@ Enter `set blackbox_device=1` to switch to logging to an onboard dataflash chip,
## Configuring the Blackbox
If you are using a short looptime like 2500 or smaller, try switching your OpenLog to 230400 baud (instead of the
If you are using a short looptime like 2500 or smaller, try switching your OpenLog to 250000 baud (instead of the
default of 115200) and set that baud rate on the Blackbox's port in the Confgurator.
The Blackbox currently provides two settings (`blackbox_rate_num` and `blackbox_rate_denom`) that allow you to control

6
src/main/blackbox/blackbox_io.c
View File

@ -456,10 +456,10 @@ bool blackboxDeviceOpen(void)
portMode = MODE_TX;
if (baudRates[baudRateIndex] > 115200) {
if (baudRates[baudRateIndex] == 230400) {
/*
* OpenLog can't keep up faster baud rates without giving it a larger inter-character gap to
* work with.
* OpenLog's 230400 baud rate is very inaccurate, so it requires a larger inter-character gap in
* order to maintain synchronization.
*/
portMode |= MODE_STOPBITS2;
}